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commit 43b1c4fe48757b0433dc0668769683eef1581029 Author: Ruk Doe <[email protected]> AuthorDate: Sat Oct 10 16:32:15 2026 +0900 Commit: michaelni <[email protected]> CommitDate: Fri Nov 6 04:39:07 2026 +0000 avcodec/libaribcaption: reset the CLUT alpha table with the CLUT clut_alpha holds the alpha values pixels are snapped to, but only its first entry was reset for each rect; the others kept the values seeded by earlier captions. Those stayed available for quantization even when the current seed palette has no such alpha, so pixels could snap to a stale alpha, e.g. to 128 instead of 255 after an earlier caption with a semi-transparent color. Reset all entries with the CLUT. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01DdDiDRusmi6eD7qSrKBjHb --- libavcodec/libaribcaption.c | 1 + 1 file changed, 1 insertion(+) diff --git a/libavcodec/libaribcaption.c b/libavcodec/libaribcaption.c index 6a1a0848c5..996b591b13 100644 --- a/libavcodec/libaribcaption.c +++ b/libavcodec/libaribcaption.c @@ -254,6 +254,7 @@ static uint8_t clut_pick_or_set(ARIBCaptionContext *ctx, int r, int g, int b, in static void clut_reset(ARIBCaptionContext *ctx) { ctx->clut[0] = CLUT_RGBA(0,0,0,0); /* transparent */ + memset(ctx->clut_alpha, 0, sizeof(ctx->clut_alpha)); ctx->clut_alpha[0] = 0xFF; ctx->clut_idx = 1; ctx->clut_overflow = 0; -- To stop receiving notification emails like this one, please contact [email protected]. _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
